Grinding-machine.



B. W. MITGHEL. GRINDING MACHINE.

APBLIOA'IIONIILED JUNE 8. '1910.

991,345. Patented May 2, 1911.

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aymmwtoz E. W. MITCHEL.

GRINDING MACHINE.

APPLICATION FILED JUNE 8, 1910.

Patentd May 2, 1911.

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witnesses E. W. MITGHEL. GRINDING MACHINE. I APPLICATION FILED 111111:8. 1010.

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q 5 Q '1 I amine/Mao Patented May 2,1911. v

E. W. MITGHBL.

GRINDING MACHINE. APPLIOATION FILED JUNE 8. 1910.

991,345. Patented May 2, 1911.

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H I! l I' M N II I iiz lh MIM hum' "MPH: I I h II a wane/ 000 Machines,of whichthe following is a speci State of Kentucky,

' My invention relates nn'wann wILson MITCHEL,-

I GRINDING-MACHINE.

To all whom it may concern: I A

Be it known that I, EDWARD W. MITCHEL, a citizen of theUnited States,residing at Lexington, in the county of. Fayette and have inventedcertain new and useful Improvements in Grindin fication to animprovement 1n grinding machines, and the object is to provide meanswhereby the speed of thecarriage can be changed from a roughing out to afinishing cut, and the cross feed of the grinding.whee l'stopped.

he invention consists in certainnovel features of construction andcombinations ed upon the shaft,

-with a gear wheel of parts which "willbe hereinafter fully de' scribedand'pointed out in the claims.

1 is a view in side elevation; Fig. 2 1s a longitudinal cross-sectionalview ';'Fig. '3'is a vertical sectional view; Fig. 45 is a top plan Viewof the tripping mechanism-; Fig. 5 is an end view of the machine; Fig. 6isa de-- tail view of the belt shifting mechanism; and Fig. 7 is adetail view showing the clutch shaft with itsclutches. V

A represents the J machine, and B is the carriage, which is providedwith bearings 1, 1, which support the shaft to -*be worked upon, asindicated at 2. A vided on one of theIbearings for transmitting a rotarymovementto the shaftLfA driving shaft 4 is mounted upon the frame,

and has a pulley 5 which is, adapted tore-- ceive power from anysuitable source for rotating the shaft 4.. A double clutch member 6 issplined upon the shaft, adapted to make engagement with either'of theclutch faces 7 and 8. Pinions 9and' 10 are mountand are adapted to mesh11, which is mounted upon a shaft 12. A shaft 13 isadapted to be throwninto engagement with the shaft 12 by the clutchmember 14 which is keyedto the shaft 13 by means of the pin 15. The rod 16, which s connected tothe clutch member 14, is adapted to reciprocate the clutch member 14"for connecting or dji'scom Specification- Letters Patent. Applicationflied. lung 8, 1910. Serial so. saas's'z.

I which is adapted to mesh with 3 In the accompanying drawings :Figure'ciprocating pulley 3 is proor tnx-meronfxnnruoxr.

heating the shafts 12 and 17 is mounted upon the adapted to be rotateduponthe rotation of the shaft 12; upon the shaft 19, which'gear wheelmeshes with the'gear wheel 17. Shafts 19- and 20 are provided withcone-shaped pulleys 21 I, and 22, respectively, a' belt two pulleystogether.- The rotation o the shaft '12 transmitting motion to the gear.wheel 17, causes the shaftl9 to be rotated through the gear wheel 18.

20-to be rotated 22 and belt-23. meshes with the 26. The shaft throughthe pulleys 21, and A pinion 24 on the shaft 20, gear wheel 25 on'theshaft 26 carries'a gear wheel 27 on the carriage B. In this manner, thecarriage is caused to beoperated.

'A shaft 29, journaled in the frame, has a lever 30 mounted thereon. Acrank arm 31 is connected to the shaftv 29, and eccentrically connectedto the crank-arm :31 is a rod 32 which carries a fork 33, which isreceived betweenthe double clutch member 6 for rethe members'upon theshaft 4, whereby the clutch member 6 will be' caused to engagefeitherthe clutch 13. A gear wheel shaft 13, which is the rack 28- maadna s,1911.

A gear wheel 18- is mounted 23 connectin the B0 1 The movement orrotation of the shaft 19 causes the shaft face 7 or 8, ac-

cording. .to the direction of-movement that the carnage is to take. Lugs34 and 35 are adjustably supported'in a slot'36 in the can riage. Theselugs are adapted to be engaged by the lever ,30'for oscillating theshaft 29. The oscillation of theshaft 29 causes the double clutch face 6to be reciprocated upon the shaft 4. For instance, the clutch 6 would bedisengaged from the clutch face 8,

indicatedin Fig.2, and thrown into engagement with the clutch. face 7and cause it to move in the opposite direction to that. in

which it was traveling when the clutch face 8 was inengagement withthe-clutch merry her 6.

The grinding wheel C is mountedupon a carriage 37,1which. movescrosswise of the machine. '-A;-rack 38 on. th engaged by a gear wheel.39. on a shaft which shaft is journaledi'n the frame A; A

e carriaget37 is gear ,41 on the shaft 40 meshes with a worm gear 42 onthe shaft 43.

A ratchet wheel 44 is mounted on the shaft .43 and is engaged by a pawl45 which is pivotally mounted upon. a. block 46.- A rod 47 is pivotallyconnected to the lever 30 and is provided with stops 48, 48, which areadapted to engage the block 46 for reciprocating it for causing the'pawl45 to rotate the ratchet wheel 44.- The rotation of the ratchet wheel44is caused by the reciprocation of the carriage, which reciprocation isgoverned by the oscillation of the lever 30. The operation ofthe lever30 by the move ment of the carriage, causes the rod 47 to be moved, andthe movement of the rod 47 moves the block 46, causing the pawl torotate the ratchet wheel 44. This movement of the ratchet wheel rotatesthe shaft 43, which transmits a step by step movement to the cross feedcarriage 37 through the worm gear 42, gear wheel 41, shaft 40, gearwheel.

39 and rack 38.

Mounted upon the carriage B is. a casing 49, which is capable of beingfed cross-wise by means of the screw 50. A lever 51 is mounted on theshaft 52 journaled in the casing 49. Journaled on the outer end of thelever, is a wheel 53 which is adapted to engage the working shaft 2. Ahandle 54 is provided on the lever for placing the wheel 53 or forraising-the lever prior to the operation of the machine, so that thelever 51 will be engaged by the spring-controlled stem 55 for holdingthe wheel out of engagement during the setting of the shaft to be workedupon. A roller 56 is journaled on the outer end of the lever 51, whichis adapted to be engagedby the'pawl 57 which is pivot-ally mounted inthe casing. The other or lower end of the pawl 57 projects through. thebottom of the casing and is adapted to trip the lovers 58 and 59.

'A rod 60 is connected to the belt 23 for shifting the belt for changingthe speed of the pulleys 21 and. 22.- A spring 61 is mounted upon therod 60, so that the rod is under spring tension, and is held under thetension by the link '62 which engages a notch 63 on the rod and holdsthe rod under the spring tension. The link 62 is connected to the bellcrank lever 59 which is operated by the pawl57 when it is desired tochange the speed of the carriage. A- link 64 is connected to the pawl45. Connected to the link 64 is the bell crank lever 58 which is adaptedto be operated by the pawl 57, for stopping the cross feed of thegrinding wheel C.

When the shaft 2 has been set and the machine is ready for operation,the wheel 53 is adjusted to. the position desired,-by the screw 50, sothat it can be automatically determined when theshaft has been grounddown to the proper shape. After the wheel has been set, the pawl'57 isbrought into engagement with the roller 56 on the lever 51, and the stem55 is withdrawn from engagement with the lever. A spring 67 holds thepawl 57 in engagement with the roller 56. When the shaft has been grounddown sufiiciently, or within a few thousandths of the required size, thespeed of the carnage is automatically changed for changing the cut ofthe shaft from a roughing to a finishing cut. This'is accomplished bythe pawl 57 coming in contact with the lever 59. As the pawl 57 comes incontact with the lever 59, the lever is tripped, operating the link 62,whereby the rod 60 is released, causing the belt 23 to be shifted uponthe pul-- leys 21 and 22, whereby the speed of the carriage is reduced.The grinding of the shaft 2 causes the wheel 53 to continue to rise, andas it rises, or moves above the shafts, the pawl 57 will be caused tomove outward, where it will come into engagement with the bell cranklever 58. The tripping of-this lever 58 will cause the pawl 45 to beraised out of engagement with the ratchet wheel 44, thereby stopping thecross feed of the grinding wheel G. The grinding wheel 0 and shaft 1 cancontinue to rotate until stopped, but the fact that the cross feed has"been stopped, the driving wheel will not produce a cutting action uponthe shaft.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In a grinding machine, the combination with a movable carriage, meansfor drivin the carriage, means for changing the spec of the carriage,means forfeedin the grinding wheel toward the carriage, o leversconnectedto the speed mechanism of the carriage and cross-feed mechanismof the grinding wheel, and mechanical tripping mechanism adapted toengage the lever for changing the speed of the carriage, and thenengaging the lever for stopping the cross-feed of the grinding wheel.

2. In a grinding machine, the combination with a movable carriage andgrinding wheel, means for driving the carriage, means for changing-thespeed of the carriage, means for feeding the grinding wheel cross-wiseof the machine, levers connected to the speed mechanism of the carria eand cross feed of the grinding wheel, 0 a lever engaging the workoperated upon, and means operated by the lever adapted to first engagethe lever for changing the speed of the carriage and then engaging thelever for stopping the cross feed of the grinding wheel.

3. In a grinding machine, the combination with a movable carriage andgrinding wheel, means for, driving the carriage, means for feeding thegrinding wheel cross-wise of the machine, of a lever adapted to engagethe work, a pawl on aging the lever ada 'ted to completion of thefinishin out for stopping be operated by t e movement of the ever, a thecross feed of the grin ing wheel. 10 lever connected to the carriagedriving In testimony whereof I afiix my signature, mechanism ada ted tobe engaged by the in the resenee of two witnesses.

awl for changing the out upon the work *DWARD WILSON MITCHEL. rom arough to a finishing cut, and a lever Witnesses: connected to the crossfeed mechanism J. H. TUDOR, adapted to be engaged by the pawl upon theB. O. Lnnes'ron.

